Heavy-duty, flexible acrylic construction is the foundation for this easy-to-use, professional three arm protractor, which is ideal for laying out course lines or plotting fixes from multiple fixed positions obtained by a sextant or hand bearing compass. Overlay it on a chart for full visibility underneath. The center arm is fixed with two adjustable arms. The hole in the center of the compass rose makes it easy to mark your position.
| Brand | Weems & Plath |
| Size | 21" |